Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

Surge or Hunt in RPM while under low load

  • dhausler
  • dhausler's Avatar Topic Author
  • Offline
  • New Member
  • New Member
More
6 years 4 months ago #35037 by dhausler
2013 3.2 4x4 ranger dual cab 4x4
We notice that when driving on low engine load between 40 and 80k/hr the rpm will slightly surge or hunt. This is actually my sons first car bought we bought at auction so no warranty to go on. But has done this from day one. The auction place had to jump start the car as battery was dead. after clearing lights this rpm surge has still remained. One time driving we noticed that while going through a round about the car shuttered ever so slightly as if we had driven on road bumps. My mechanic was suggesting EGR but otherwise injectors. When the car runs at 100 it will cruise nicely, no surge. It starts always first time, and idles well, has never stopped.

We have since had the Manifold and egr de-sooted and cleaned, they were very clogged. Even had the EGR blanked. The MAF connection is ok.

When we picked car up from local mechanic yesterday, it straight away did the same; low load rpm surges. this time however the traction control light came on then engine light. We pulled over as we noticed we were stuck in 1st. put car in park and then drive, the transmission did made a clunk noise and still could only get 1st gear, no matter what we did. If I was in a manual I would say the clutch had gone by the way it was taking off and trying to grab the gear taking off from a stop position. BUT this could simply be 'limp mode'. never had that before. Limped it back to mechanics...….

Who in the Croydon/Ringwood area would be recommended to see, have suggested to mechanic and son that it needs to now go to auto specialist guy to check out transmission and rule that out just in case its torque convertor or solenoids, then once that is cleared and if still not solved to a diesel specialist to check that the injectors are ok before we just swap them out.

Appreciate assistance

Please Log in or Create an account to join the conversation.

  • dhausler
  • dhausler's Avatar Topic Author
  • Offline
  • New Member
  • New Member
More
6 years 4 months ago #35047 by dhausler
Replied by dhausler on topic Surge or Hunt in RPM while under low load
Quick update, have heard from a friend of a friend - ex Ford Aust. that it may be the Suction Control Valve playing up. This often occurs in ex mine vehicles.… Will check that out Monday.

Please Log in or Create an account to join the conversation.

Time to create page: 0.274 seconds